We currently do not allow bulk e-mail sending from our mail servers, due to the large load it causes on the mail server and frequent blacklisting of email server IP address. Such events cause wide spread difficulty to all the users on server. Please read our Para. 7 of AUP
for details. Our limits are suitable for most community websites, however should you need to do email marketing, send bulk e-mails, it is recommended to use an e-mail service which specializes in bulk e-mails.
Please raise a support ticket of clarifications or further information.